Sand Timer
 
History of the Hourglass Sand TimerThe hourglass, also known as a sand timer, sand glass, or sand clock, is a device traditionally used for the measurement of time. It consists of two glass bulbs resting one on top of the other connected by a narrow opening. The top bulb is filled with sand which flows through the opening into the lower bulb at a given rate dependent on the volume and size of the sand and size and angle of the glass bulbs. The hourglass can then be inverted and the sand will again flow from bulb to bulb. Alternatives to sand are used in some instances. Since the hourglass was one of the few reliable methods of measuring time at sea, it has been speculated that it was in use as far back as the 11th century, where it would have complimented the magnetic compass as an aid to navigation. Not until the 14th century is there actual evidence of their existence, appearing in a painting by Ambrogio Lorenzetti in 1328. The earliest written records come from the same period and appear in lists of ship stores. From the 15th century on they were being used widely at sea, in churches, in industry, and for cooking. They were the first dependable, reusable, reasonably accurate method of measuring time

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BRASS SAND TIMER HOURGLASS WITH 4 ROD ANTIQUE FINISH
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BRASS SAND WATCH WANDER ARE LOST SAND TIMER HOUR GLASS
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SAND WATCH KELVIN & HUGHES SAND TIMER HOUR GLASS
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SAND WATCH LIQUID BRASS SAND TIMER HOUR GLASS ANTIQUE
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SAND WATCH KELWIN & HUGHES SAND TIMER HOUR GLASS
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AMAZING GIFT ITEM 3 in 1 Hourglass, Wood Art Gift, Wood Sand, Sand Timer
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BRASS SWINGING SAND TIMER WITH WOODEN BASE
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BRASS SWINGING HANDMADE SAND TIMER
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BRASS SAND WATCH SWINGING BRASS SAND TIMER WITH CALENDER ON TOP SHINNING LOOK